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3.22 numbers (Bennett, 1981, CDOW, 1982). Brown trout and rainbow trout collectively account for about 5 to 40 percent of the total catch. The Roaring Fork River seems to be quite productive, as standing crops for browns and rainbows are estimated at about 200 fish/acre (Bennett, 1981). Fish communities in the Colorado River between Glenwood Springs and Cameo, Colorado, represent a mixture of both cool- and warm-water species. Of 21 species collected in a stretch between Rifle and Palisades, bluehead sucker, flannelmouth sucker (C. latiainnis), carp (Cvprinus carpio), roundtail chub (Gila robusta), speckled dace (Rhinichthvs osculus), fathead minnow (Pimephales promelas), and red shiner (Notropis lutrensis) usually are the most abundant taxa (Table 3.10) (Holden and Stalnaker, 1975; CDOW, 1981; Valdez et al., 1982). Other species considered numerous in this section of the river include white sucker (C. catostomus), green sunfish (Leoomis cyanellus), mottled sculpin, sand shiner (Notropis stramineus), and black bullhead (Ictalurus melas). Brown trout and rainbow trout were stocked by CDOW. 3.3.3 Threatened and Endangered Fishes Three species of fish endemic to the Colorado River are listed as endangered on both the federal and Colorado lists: bonytail chub (Gila elegans), humpback chub (Gila cvaha), and Colorado squawfish (Ptychocheilus lucius). In addition, the razorback sucker (Xvrauchen texanus) is listed as an endangered species on the Colorado list. All of these species have been collected in the upper basin of the Colorado River. A brief description of distribution and general habitat requirements for the three species occurring in the Colorado River is provided below and in Table 3.11. A specific biological assessment was prepared for the Fish and Wildlife Service as a separate document. The Colorado squawfish currently occupies about 880 river miles in the Colorado River system (25 percent of its original range) and is presently found only in the upper Colorado River basin above Glen Canyon Dam. It inhabits about 350 miles of the mainstem Green River from its mouth to the mouth of the Yampa River. Its range also extends 140 miles up the Yampa River and 156 miles up the White River, the two major tributaries of the Green River. In the mainstem Colorado River, it is currently found from Lake Powell extending about 201 miles upstream to Palisade, Colorado, and in the lower 33 miles of the Gunnison River, a tributary to the mainstem Colorado River (Tyus et al., 1982).